Learning Perl. 3rd Edition Tom Phoenix, Randal L. Schwartz

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• Learning Perl, 3rd Edition
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  • A Note Regarding Supplemental Files
  • Preface
    • Typographical Conventions
    • How to Contact Us
    • Code Examples
    • History of This Book
    • Acknowledgments
  • 1. Introduction
    • 1.1. Questions and Answers
      • 1.1.1. Is This the Right Book for You?
      • 1.1.2. Why Are There So Many Footnotes?
      • 1.1.3. What About the Exercises and Their Answers?
      • 1.1.4. What Do Those Numbers Mean at the Start of the Exercise?
      • 1.1.5. What If Im a Perl Course Instructor?
    • 1.2. What Does "Perl" Stand For?
      • 1.2.1. Why Didn't Larry Just Use Some Other Language?
      • 1.2.2. Is Perl Easy or Hard?
      • 1.2.3. How Did Perl Get to Be So Popular?
      • 1.2.4. What's Happening with Perl Now?
      • 1.2.5. What's Perl Really Good For?
      • 1.2.6. What Is Perl Not Good For?
    • 1.3. How Can I Get Perl?
      • 1.3.1. What Is CPAN?
      • 1.3.2. How Can I Get Support for Perl?
      • 1.3.3. Are There Any Other Kinds of Support?
      • 1.3.4. What If I Find a Bug in Perl?
    • 1.4. How Do I Make a Perl Program?
      • 1.4.1. A Simple Program
      • 1.4.2. What's Inside That Program?
      • 1.4.3. But How Do I Compile Perl?
    • 1.5. A Whirlwind Tour of Perl
    • 1.6. Exercises
  • 2. Scalar Data
    • 2.1. What Is Scalar Data?
    • 2.2. Numbers
      • 2.2.1. All Numbers Are the Same Format Internally
      • 2.2.2. Floating-Point Literals
      • 2.2.3. Integer Literals
      • 2.2.4. Nondecimal Integer Literals
      • 2.2.5. Numeric Operators
    • 2.3. Strings
      • 2.3.1. Single-Quoted String Literals
      • 2.3.2. Double-Quoted String Literals
      • 2.3.3. String Operators
      • 2.3.4. Automatic Conversion Between Numbers and Strings
    • 2.4. Perl's Built-in Warnings
    • 2.5. Scalar Variables
      • 2.5.1. Choosing Good Variable Names
      • 2.5.2. Scalar Assignment
      • 2.5.3. Binary Assignment Operators
    • 2.6. Output with print
      • 2.6.1. Interpolation of Scalar Variables into Strings
      • 2.6.2. Operator Precedence and Associativity
      • 2.6.3. Comparison Operators
    • 2.7. The if Control Structure
      • 2.7.1. Boolean Values
    • 2.8. Getting User Input
    • 2.9. The chomp Operator
    • 2.10. The while Control Structure
    • 2.11. The undef Value
    • 2.12. The defined Function
    • 2.13. Exercises
  • 3. Lists and Arrays
    • 3.1. Accessing Elements of an Array
    • 3.2. Special Array Indices
    • 3.3. List Literals
      • 3.3.1. The qw Shortcut
    • 3.4. List Assignment
      • 3.4.1. The pop and push Operators
      • 3.4.2. The shift and unshift Operators
    • 3.5. Interpolating Arrays into Strings
    • 3.6. The foreach Control Structure
    • 3.7. Perl's Favorite Default: $_
      • 3.7.1. The reverse Operator
      • 3.7.2. The sort Operator
    • 3.8. Scalar and List Context
      • 3.8.1. Using List-Producing Expressions in Scalar Context
      • 3.8.2. Using Scalar-Producing Expressions in List Context
      • 3.8.3. Forcing Scalar Context
    • 3.9. <STDIN> in List Context
    • 3.10. Exercises
  • 4. Subroutines
    • 4.1. System and User Functions
    • 4.2. Defining a Subroutine
    • 4.3. Invoking a Subroutine
    • 4.4. Return Values
    • 4.5. Arguments
    • 4.6. Private Variables in Subroutines
    • 4.7. The local Operator
      • 4.7.1. The Difference Between local and my
    • 4.8. Variable-length Parameter Lists
      • 4.8.1. A Better &max Routine
      • 4.8.2. Empty Parameter Lists
    • 4.9. Notes on Lexical (my) Variables
    • 4.10. The use strict Pragma
    • 4.11. The return Operator
      • 4.11.1. Omitting the Ampersand
    • 4.12. Exercises
  • 5. Hashes
    • 5.1. What Is a Hash?
      • 5.1.1. Why Use a Hash?
    • 5.2. Hash Element Access
      • 5.2.1. The Hash as a Whole
      • 5.2.2. Hash Assignment
      • 5.2.3. The Big Arrow
    • 5.3. Hash Functions
      • 5.3.1. The keys and values Functions
      • 5.3.2. The each Function
    • 5.4. Typical Use of a Hash
      • 5.4.1. The exists Function
      • 5.4.2. The delete Function
      • 5.4.3. Hash Element Interpolation
    • 5.5. Exercises
  • 6. I/O Basics
    • 6.1. Input from Standard Input
    • 6.2. Input from the Diamond Operator
    • 6.3. The Invocation Arguments
    • 6.4. Output to Standard Output
    • 6.5. Formatted Output with printf
      • 6.5.1. Arrays and printf
    • 6.6. Exercises
  • 7. Concepts of Regular Expressions
    • 7.1. What Are Regular Expressions?
    • 7.2. Using Simple Patterns
      • 7.2.1. About Metacharacters
      • 7.2.2. Simple Quantifiers
      • 7.2.3. Grouping in Patterns
      • 7.2.4. Alternatives
    • 7.3. A Pattern Test Program
    • 7.4. Exercises
  • 8. More About Regular Expressions
    • 8.1. Character Classes
      • 8.1.1. Character Class Shortcuts
      • 8.1.2. Negating the Shortcuts
    • 8.2. General Quantifiers
    • 8.3. Anchors
      • 8.3.1. Word Anchors
    • 8.4. Memory Parentheses
      • 8.4.1. Backreferences
      • 8.4.2. Memory Variables
    • 8.5. Precedence
      • 8.5.1. Examples of Precedence
      • 8.5.2. And There's More
    • 8.6. Exercises
  • 9. Using Regular Expressions
    • 9.1. Matches with m//
    • 9.2. Option Modifiers
      • 9.2.1. Case-insensitive Matching with /i
      • 9.2.2. Matching Any Character with /s
      • 9.2.3. Combining Option Modifiers
      • 9.2.4. Other Options
    • 9.3. The Binding Operator, =~
    • 9.4. Interpolating into Patterns
    • 9.5. The Match Variables
      • 9.5.1. The Persistence of Memory
      • 9.5.2. The Automatic Match Variables
    • 9.6. Substitutions with s///
      • 9.6.1. Global Replacements with /g
      • 9.6.2. Different Delimiters
      • 9.6.3. Option Modifiers
      • 9.6.4. The Binding Operator
      • 9.6.5. Case Shifting
    • 9.7. The split Operator
    • 9.8. The join Function
    • 9.9. Exercises
  • 10. More Control Structures
    • 10.1. The unless Control Structure
      • 10.1.1. The else Clause with unless
    • 10.2. The until Control Structure
    • 10.3. Expression Modifiers
    • 10.4. The Naked Block Control Structure
    • 10.5. The elsif Clause
    • 10.6. Autoincrement and Autodecrement
      • 10.6.1. The Value of Autoincrement
    • 10.7. The for Control Structure
      • 10.7.1. The Secret Connection Between foreach and for
    • 10.8. Loop Controls
      • 10.8.1. The last Operator
      • 10.8.2. The next Operator
      • 10.8.3. The redo Operator
      • 10.8.4. Labeled Blocks
    • 10.9. Logical Operators
      • 10.9.1. The Value of a Short-Circuit Operator
      • 10.9.2. The Ternary Operator, ?:
      • 10.9.3. Control Structures Using Partial-Evaluation Operators
    • 10.10. Exercise
  • 11. Filehandles and File Tests
    • 11.1. What Is a Filehandle?
    • 11.2. Opening a Filehandle
      • 11.2.1. Closing a Filehandle
      • 11.2.2. Bad Filehandles
    • 11.3. Fatal Errors with die
      • 11.3.1. Warning Messages with warn
    • 11.4. Using Filehandles
      • 11.4.1. Changing the Default Output Filehandle
    • 11.5. Reopening a Standard Filehandle
    • 11.6. File Tests
      • 11.6.1. The stat and lstat Functions
      • 11.6.2. The localtime Function
      • 11.6.3. Bitwise Operators
      • 11.6.4. Using Bitstrings
      • 11.6.5. Using the Special Underscore Filehandle
    • 11.7. Exercises
  • 12. Directory Operations
    • 12.1. Moving Around the Directory Tree
    • 12.2. Globbing
    • 12.3. An Alternate Syntax for Globbing
    • 12.4. Directory Handles
    • 12.5. Recursive Directory Listing
    • 12.6. Exercises
  • 13. Manipulating Files and Directories
    • 13.1. Removing Files
    • 13.2. Renaming Files
    • 13.3. Links and Files
    • 13.4. Making and Removing Directories
    • 13.5. Modifying Permissions
    • 13.6. Changing Ownership
    • 13.7. Changing Timestamps
    • 13.8. Using Simple Modules
      • 13.8.1. The File::Basename Module
      • 13.8.2. Using Only Some Functions from a Module
      • 13.8.3. The File::Spec Module
    • 13.9. Exercises
  • 14. Process Management
    • 14.1. The system Function
      • 14.1.1. Avoiding the Shell
    • 14.2. The exec Function
    • 14.3. The Environment Variables
    • 14.4. Using Backquotes to Capture Output
      • 14.4.1. Using Backquotes in a List Context
    • 14.5. Processes as Filehandles
    • 14.6. Getting Down and Dirty with Fork
    • 14.7. Sending and Receiving Signals
    • 14.8. Exercises
  • 15. Strings and Sorting
    • 15.1. Finding a Substring with index
    • 15.2. Manipulating a Substring with substr
    • 15.3. Formatting Data with sprintf
      • 15.3.1. Using sprintf with "Money Numbers"
    • 15.4. Advanced Sorting
      • 15.4.1. Sorting a Hash by Value
      • 15.4.2. Sorting by Multiple Keys
    • 15.5. Exercises
  • 16. Simple Databases
    • 16.1. DBM Files and DBM Hashes
      • 16.1.1. Opening and Closing DBM Hashes
      • 16.1.2. Using a DBM Hash
    • 16.2. Manipulating Data with pack and unpack
    • 16.3. Fixed-length Random-access Databases
    • 16.4. Variable-length (Text) Databases
      • 16.4.1. In-place Editing from the Command Line
    • 16.5. Exercises
  • 17. Some Advanced Perl Techniques
    • 17.1. Trapping Errors with eval
    • 17.2. Picking Items from a List with grep
    • 17.3. Transforming Items from a List with map
    • 17.4. Unquoted Hash Keys
    • 17.5. More Powerful Regular Expressions
      • 17.5.1. Non-greedy Quantifiers
      • 17.5.2. Matching Multiple-line Text
    • 17.6. Slices
      • 17.6.1. Array Slice
      • 17.6.2. Hash Slice
    • 17.7. Exercise
  • A. Exercise Answers
    • A.1. Answers to Chapter 2 Exercises
    • A.2. Answers to Chapter 3 Exercises
    • A.3. Answers to Chapter 4 Exercises
    • A.4. Answers to Chapter 5 Exercises
    • A.5. Answers to Chapter 6 Exercises
    • A.6. Answers to Chapter 7 Exercises
    • A.7. Answers to Chapter 8 Exercises
    • A.8. Answers to Chapter 9 Exercises
    • A.9. Answer to Chapter 10 Exercise
    • A.10. Answers to Chapter 11 Exercises
    • A.11. Answers to Chapter 12 Exercises
    • A.12. Answers to Chapter 13 Exercises
    • A.13. Answers to Chapter 14 Exercises
    • A.14. Answers to Chapter 15 Exercises
    • A.15. Answers to Chapter 16 Exercises
    • A.16. Answer to Chapter 17 Exercises
  • B. Beyond the Llama
    • B.1. Further Documentation
    • B.2. Regular expressions
    • B.3. Packages
    • B.4. Extending Perl's Functionality
      • B.4.1. Libraries
      • B.4.2. Modules
      • B.4.3. Finding and Installing Modules
      • B.4.4. Writing Your Own Modules
    • B.5. Some Important Modules
      • B.5.1. The CGI and CGI_Lite Modules
      • B.5.2. The Cwd Module
      • B.5.3. The Fatal Module
      • B.5.4. The File::Basename Module
      • B.5.5. The File::Copy Module
      • B.5.6. The File::Spec Module
      • B.5.7. The Image::Size Module
      • B.5.8. The Net::SMTP Module
      • B.5.9. The POSIX Module
      • B.5.10. The Sys::Hostname Module
      • B.5.11. The Text::Wrap Module
      • B.5.12. The Time::Local Module
    • B.6. Pragmas
      • B.6.1. The constant Pragma
      • B.6.2. The diagnostics Pragma
      • B.6.3. The lib Pragma
      • B.6.4. The strict Pragma
      • B.6.5. The vars Pragma
      • B.6.6. The warnings Pragma
    • B.7. Databases
      • B.7.1. Direct System Database Access
      • B.7.2. Flat-file Database Access
      • B.7.3. Relational Database Access
    • B.8. Other Operators and Functions
      • B.8.1. Transliteration with tr///
      • B.8.2. Here documents
    • B.9. Mathematics
      • B.9.1. Advanced Math Functions
      • B.9.2. Imaginary and Complex Numbers
      • B.9.3. Large and High-Precision Numbers
    • B.10. Lists and Arrays
      • B.10.1. map and grep
      • B.10.2. The splice Operator
    • B.11. Bits and Pieces
    • B.12. Formats
    • B.13. Networking and IPC
      • B.13.1. System V IPC
      • B.13.2. Sockets
    • B.14. Security
    • B.15. Debugging
    • B.16. The Common Gateway Interface (CGI)
    • B.17. Command-Line Options
    • B.18. Built in Variables
    • B.19. Syntax Extensions
    • B.20. References
      • B.20.1. Complex Data Structures
      • B.20.2. Object-Oriented Programming
      • B.20.3. Anonymous Subroutines and Closures
    • B.21. Tied Variables
    • B.22. Operator Overloading
    • B.23. Dynamic Loading
    • B.24. Embedding
    • B.25. Converting Other Languages to Perl
    • B.26. Converting find Command Lines to Perl
    • B.27. Command-line Options in Your Programs
    • B.28. Embedded Documentation
    • B.29. More Ways to Open Filehandles
    • B.30. Locales and Unicode
    • B.31. Threads and Forking
    • B.32. Graphical User Interfaces (GUIs)
    • B.33. And More...
  • Index
  • About the Authors
  • Colophon
  • SPECIAL OFFER: Upgrade this ebook with OReilly

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